Add wxWindow::EnableTouchEvents()

Don't request touch event generation for all windows by default, this
has an inherent overhead and is not needed for 99% of the application
windows, so require calling EnableTouchEvents() explicitly to do it
instead.

Note that this requires properly initializing gesture recognizers in
wxOSX now that they're not always allocated, otherwise releasing them
when destroying the window would crash.

include/wx/gtk/window.h

@@ -77,6 +77,9 @@ public:
     virtual bool Reparent( wxWindowBase *newParent ) wxOVERRIDE;
 
     virtual void WarpPointer(int x, int y) wxOVERRIDE;
+#ifdef __WXGTK3__
+    virtual bool EnableTouchEvents(int eventsMask) wxOVERRIDE;
+#endif // __WXGTK3__
 
     virtual void Refresh( bool eraseBackground = true,
                           const wxRect *rect = (const wxRect *) NULL ) wxOVERRIDE;

include/wx/msw/window.h

@@ -100,6 +100,7 @@ public:
     virtual bool Reparent(wxWindowBase *newParent) wxOVERRIDE;
 
     virtual void WarpPointer(int x, int y) wxOVERRIDE;
+    virtual bool EnableTouchEvents(int eventsMask) wxOVERRIDE;
 
     virtual void Refresh( bool eraseBackground = true,
                           const wxRect *rect = (const wxRect *) NULL ) wxOVERRIDE;

include/wx/osx/cocoa/private.h

@@ -128,6 +128,7 @@ public :
     void                SetToolTip( wxToolTip* tooltip );
 
     void                InstallEventHandler( WXWidget control = NULL );
+    bool                EnableTouchEvents(int eventsMask);
 
     virtual bool        ShouldHandleKeyNavigation(const wxKeyEvent &event) const;
     bool                DoHandleKeyNavigation(const wxKeyEvent &event);

include/wx/osx/core/private.h

@@ -326,6 +326,8 @@ public :
 
     virtual void        InstallEventHandler( WXWidget control = NULL ) = 0;
 
+    virtual bool        EnableTouchEvents(int eventsMask) = 0;
+
     // Mechanism used to keep track of whether a change should send an event
     // Do SendEvents(false) when starting actions that would trigger programmatic events
     // and SendEvents(true) at the end of the block.

include/wx/osx/iphone/private.h

@@ -105,6 +105,7 @@ public :
     void                SetFont( const wxFont & font , const wxColour& foreground , long windowStyle, bool ignoreBlack = true );
 
     void                InstallEventHandler( WXWidget control = NULL );
+    bool                EnableTouchEvents(int WXUNUSED(eventsMask)) { return false; }
 
     virtual void        DoNotifyFocusEvent(bool receivedFocus, wxWidgetImpl* otherWindow);
 

include/wx/osx/window.h

@@ -77,6 +77,7 @@ public:
     virtual void SetFocus() wxOVERRIDE;
 
     virtual void WarpPointer( int x, int y ) wxOVERRIDE;
+    virtual bool EnableTouchEvents(int eventsMask) wxOVERRIDE;
 
     virtual void Refresh( bool eraseBackground = true,
                           const wxRect *rect = NULL ) wxOVERRIDE;

include/wx/window.h

@@ -133,6 +133,13 @@ enum wxShowEffect
     wxSHOW_EFFECT_MAX
 };
 
+// Values for EnableTouchEvents() mask.
+enum
+{
+    wxTOUCH_NONE            = 0x0000,
+    wxTOUCH_ALL_GESTURES    = 0x00ff
+};
+
 // flags for SendSizeEvent()
 enum
 {
@@ -1033,6 +1040,13 @@ public:
     virtual bool HasCapture() const
         { return (wxWindow *)this == GetCapture(); }
 
+        // enable the specified touch events for this window, return false if
+        // the requested events are not supported
+    virtual bool EnableTouchEvents(int WXUNUSED(eventsMask))
+    {
+        return false;
+    }
+
     // painting the window
     // -------------------